If two resistors are in series I know you add the resistance values together. What about wattage?? If I need 30r 1/2 watt can I use two 15r 1/4 watt resistors??? Seems like an elementary question but I have not been able to locate any info on it despite multiple searches with different search terms.
Make sure you use 2 x 15R 1/4W to make out a 30R 1/2W. If you use 1 x 9R 1/4W and 1 x 21R 1/4W resistor, it may not work depending on the current within the circuit.